we're kind of in it ? Not sure there's an ah-ha metric to go by.
- look at the quality of purity in blue sky through which the most intense insolation of the year shines through, under 21C at 850 mb expanding to 22.5 by 00z, which means we mixed to that level on a perfect WNW d-slope flow. Huge non-Markovian factor from yesterday's heat plays in ...? These intuitively look like constructive interference; at a minimum, "rogue waves" are born out of that playing field.
It's already 101 out at Winthrop if you believe NWS ...and there's numerous 100s dappled about the greater Boston metro area. Lots of 97 along I-95, pouring d-slope from that near 400' elevation of Arlington's ridge line right down Rt 2 into the city... All that a 11:30
and these scenarios are unbroken through dark?
mm... we have a shot at something special in some of the coastal urban centers... Not just Boston.